Merge pull request #22 from madarche/improve-examples

Improve examples
Rename example file
Configure as reusable module
Reorganize and provide info about `fs2`
Add info about workarounds for EMFILE errors
Do not use stats directly
Improve explanation of `deferred.gate`. Fix #21
Improve description of benchmark
-- clean
Added optimization to just read the first N bytes

It's not done using stream yet. Next version will.